English to English

noun (n)

• a walker or runner who trips and almost falls(noun.person)

  Synonym:
  tripper
  

  source: wordnet30
• someone who makes mistakes because of incompetence(noun.person)

  Synonym:
  blunderer, botcher, bumbler, bungler, butcher, fuckup, fumbler, sad sack
  

  source: wordnet30
• One who stumbles.(noun)

  source: webster1913